Discocactus zehntneri belongs to the Cactaceae (the Cactus family). It is a perennial herb that is endemic to southern Brazil. This cactus grows on sands and gravels, 400-1200 m above sea level. The stem is dull-green 10-20 cm in diameter and 7-10 cm tall. The 12-20 ribs are slightly humped and up to 10 mm high. The strong, white to yellowish thorns are bent downwards and interwoven so tightly that they cover the plant body. The pseudo-cephalium is cream-colored to white, up to 1 cm tall and -4 cm wide, at the apex of the plant. The flowers are white slender funnel-shaped, up to 20 cm long. The fruits are red club-shaped and have a length of up to 2.5 cm.